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Generalized Least-Squares Regressions I: Efficient Derivations

By Nataniel Greene


Ordinary least-squares regression suffers from a fundamental lack of symmetry: the regression line of y given x and the regression line of x given y are not inverses of each other. Alternative symmetric regression methods have been developed to address this concern, notably: orthogonal regression and geometric mean regression. This paper presents in detail a variety of least squares regression methods which may not have been known or fully explicated. The derivation of each method is made efficient through the use of Ehrenberg\u27s formula for the ordinary least-squares error and through the extraction of a weight function g(b) which characterizes the regression. For every case of generalized least-squares, the error between the line and the data is shown to be a product of the weight function g(b) and Ehrenberg\u27s error formula

Topics: Generalized least-squares regression, least-squares, symmetric least-squares, weighted ordinary least-squares, orthogonal regression, geometric mean regression, Applied Mathematics, Mathematics, Numerical Analysis and Computation, Statistics and Probability
Publisher: CUNY Academic Works
Year: 2013
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